Distance.java |
1 /** 2 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved. 3 * 4 * 5 * 6 * 7 * The contents of this file are subject to the terms of the Liferay Enterprise 8 * Subscription License ("License"). You may not use this file except in 9 * compliance with the License. You can obtain a copy of the License by 10 * contacting Liferay, Inc. See the License for the specific language governing 11 * permissions and limitations under the License, including but not limited to 12 * distribution rights of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 20 * SOFTWARE. 21 */ 22 23 package com.liferay.util; 24 25 /** 26 * <a href="Distance.java.html"><b><i>View Source</i></b></a> 27 * 28 * @author Brian Wing Shun Chan 29 */ 30 public class Distance { 31 32 public static double calculate(double lat1, double lon1, 33 double lat2, double lon2) { 34 35 // Convert from radians to degrees 36 37 lat1 = (Math.PI * lat1) / 180; 38 lon1 = (Math.PI * lon1) / 180; 39 lat2 = (Math.PI * lat2) / 180; 40 lon2 = (Math.PI * lon2) / 180; 41 42 double miles = 43 3963.4 * 44 Math.acos( 45 (Math.sin(lat1) * Math.sin(lat2)) + 46 (Math.cos(lat1) * Math.cos(lat2) * Math.cos(lon1 - lon2))); 47 48 return miles; 49 } 50 51 public static double kmToMiles(double km) { 52 return km * 0.621; 53 } 54 55 public static double milesToKm(double miles) { 56 return miles / 0.621; 57 } 58 59 }